The chairs are comfortable and stylish however the back height adjustment does not actually work. You can adjust the back rest up and down for comfort based on height if you are leaning on it, but it will not lock in place. There's nothing designed to hold the back rest at the desired height. We have 3 chairs and built by 3 different people. So it wasn't a setup error. As soon as you move, it drops back down... and it is not quiet! Sharing an office with these chairs - you need noise cancelling headphones if you want to be comfortable. Or leave the back rest at the low height and sit awkwardly.